Costa has scored seven goals in four Premier League games for the Blues, while his Spanish teammate Cesc Fabregas has laid on six assists. The pair have formed a dangerous partnership, with Fabregas supplying two of the killer passes for Costa’s hatrick against Swansea on Saturday.

“To play with Fabregas is the dream of every striker,” Mourinho said

“The guy sees the movement, sees the pass, is not selfish, makes always the right choice.”

Mourinho brought the pair to Stamford Bridge for a combined fee believed to be just shy of £60m, and they already seem to be proving their worth.

The Former Arsenal captain Cesc Fabregas added “Just trying to do my job. That’s it. We have a good team, strong, young, with a lot of courage. We showed it again.”

Chelsea have been unusually leaky in defence this season, conceding five goals in their last two games. With Costa up front and the team scoring ten in those same two games they have been spared some blushes, but Mourinho is still not happy.

“I don’t like (conceding), but we were analysing the goals against Everton and trying to identify the mistakes and we’ll do the same thing with these two goals (against Swansea),” said the Portuguese manager.

“If you score more goals than the opponent you win, but you want to be more consistent behind because it’s not possible to always score four, five, six or three.”

“There will come a time when we need a point and a 0-0 is a point or we need a victory and 1-0 is also a victory,” he continued.

Chelsea’s other new signing Loic Remy also got off the mark against Swansea, scoring on his debut after just nine minutes on the pitch. His goal will probably be largely forgotten however, in the wake of Costa’s hatrick.